I have some bleeding bright red and dark brown, then a little pinkish ,its way lighter than my usual period. is this implantation bleeding, some cramp?

Pregnant possibility: This change in bleeding could be related to a pregnancy but may also just be mild variation in your menses. have you taken a pregnancy test. I would suggest taking one if you are unsure. If you have been faithful with your birth control pills then pregnancy isn't very likely. Menses can become lighter on the pill and some women even stop having menses on the pill